Attachment for lathes



May 26, 1953 R. c. PALMER ATTACHMENT FOR LATHES 4 Sheets-Sheet 1 Filed May 7. 194a INVENTOR. RAYMOND C. PALMER WWI-de ATTORNEYS May 26, 1953 R. c. PALMER ATTACHMENT FOR LATHES 4 Sheets-Sheet 2 Filed May 7, 1948 INVENTOR. RAYMOND c. PALMER Wmww ATTORNEYS May 26, 1953 R. c. PALMER 2,639,543

ATTACHMENT FOR LATHES 1 Filed May '7, 1948 4 Sheets-Sheet 3 V INVENTOR. RAYMOND C. PALMER ATTORNEYS Mafzii, 5 R. c. PALMER 2,639,643

ATTACHMENT FOR LATHES Filed May '7. 1948 4 Sheets-Sheet 4 BY RAYMOND C. PALMER ATTORNEYS FIG? Patented May 26, 1953 UNITED STATES PATENT OFFICE ATTACHMENT FOR LATHES Raymond C. Palmer, Chicago, Ill.

Application May 7, 1948, Serial No. 25,765

6 Claims.

This invention relates to attachments for lathes and, more particularly, to milling and boring attachments for lathes.

This application is a continuation-in-part of my co-pending application, Serial No. 676,145, filed June 12, 1946, and now abandoned.

A primary object of my invention is to afiord a novel attachment for lathes whereby milling and boring operations, and the like, may be performed in a novel and expeditious-manner.

Another object is to construct an attachment of the aforementioned type in such a manner that a substantially unitary structure is provided which may be quickly and easily mounted in operative position on a lathe and, when so positioned, may be readil operated in an expeditious manner.

A further object of my invention is to provide an attachment for lathes embodying a novel toolholding device whereby a milling cutter, boring tool, or the like, may be driven by the power unit of the lathe in a novel and practical manner, and the tool-holding device may be quickly and easily adjusted to afford ready adjustment of the position of a tool being used.

Yet another object of my invention is to so construct an attachment of the aforementioned type that it may be readily used, in a novel manner, to machine work-pieces mounted on a carriage which may be operatively connected to the usual longitudinal feed and cross feed of a lathe.

Another object of my invention is to construct a novel attachment of the aforementioned type in such a manner that a tool may be adjustably mounted on .a frame which is so constructed and may be so mounted on a lathe that the movable carriage of the lathe is relatively freely movable and may be used in a novel and expeditious manner to feed work past a tool so supported.

A further object of my invention is to provide a novel attachment of the aforementioned type which is sturdily constructed, accurate in operation, and may be manufactured commercially in an economic and practical manner.

Other and further objects of the present in vention will be apparent from the following description and claims and are illustrated in the accompanying drawings which, by way of illustration, show a preferred embodiment and the principles thereof and what I now consider to be the best mode in which I have contemplated applying those principles. Other embodiments of the invention embodying the same or equivalent principles may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

In the drawings:

Fig. 1 is a side elevational view of a preferred form of an attachment mounted in operative position on :a lathe, and embodying the principles of my invention;

Fig. 2 is a top plan view, partly in section, taken substantially along the line 22 in Fig. 1;

Fig. 3 is a sectional view taken substantially along the line 3-3 in Fig. 1;

Fig. 4 is a sectional view taken substantially along the line 44 in Fig. 1;

Fig. 5 is a detail sectional view of the toolholding device shown in Fig. 1;

Fig. 6 is a sectional view taken substantially along the line 66 in Fig. 5;

Fig. 7 is a detail sectional view taken substantially along the line l'l in Fig. 6; and

Fig. 8 is a sectional view taken substantially along the line 88 in Fig. 5.

A typical embodiment of my invention is illustrated in Figs. 1 to 8, inclusive, of the drawings, wherein is shown a milling and boring attachment 20 mounted in operative position on a lathe 22, Fig. 1.

The lathe 22 is of the conventional type having the usual head stock 24 and parallel ways 26 and 21, Figs. 1 and 3. The usual travelling carriage 29 is mounted on the ways 26 and 2! and has a work-holding vise 3| mounted thereon, which vise may be any one of several types heretofore known to those skilled in the art and customarily used for such purposes.

The attachment 26 comprises a frame member 32, mounted on the ways 26 and 21 of the lathe 22, and a tool-holding device 34 mounted on the frame 32 and operable to hold and drive various types of tools such as, for example, milling cutters, boring tools, and the like. all of which will be described in greater detail hereinafter.

The frame member 32 comprises two end plates '36 and 31, connected together, in parallel relation, by two parallel side bars 46 and 4E.

The end plate 36 has a body portion and :an arm 59 projecting upwardly therefrom, Fig. :3. The body portion 43 comprises a substantially flat, central web member 45 surrounded by a reinforcing flange 46, the flange 455 being of sufiicient width to afiord a rigid structure. The lower portion of the flange 46 is somewhat thicker than the other portions thereof to afford a base 48, and the edges of the base 48 are cut-away to afiord recesses 59 and within which the ways 26 and 27, respectively, are engaged when the end plate 36 is mounted in operative position on the lathe 24. The end plate 36 is releasably secured in position on the ways 23 and 21 by suitable means such as a clamping plate 53 held in engagement therewith by a bolt 55 extending through the clamping plate 53 and the base 3-8 and held therein by a nut 51.

The arm 58 is of somewhat lesser width than the body portion 43, and affords an extension therefor for a purpose which will be discussed in greater detail presently. The arm 5Q, like the body portion 36 comprises a web 5| having reinforcing fianges 63 and 64 positioned along opposite sides thereof.

Two bosses 66 and 51, Figs. 1 and 2, are formed on the body portion 43 or" the end=plate36 and project outwardly from the web 45 thercofrint'o alignment with the free edge of the flange 46. The bosses 6t and 61 have openings formed therein through which threaded end portions 159 and 10 of the side bars ED and ,4], respectively, project, the side bars being releasably secured in this position by nuts l2 and 73 mounted on the end portions or studs 59and 19.

Two openings and 76 are also formed in the Web 45 of the end plate for purposes which will be discussed in greater detail presently, the

opening 15 being substantially circular in shape and the opening 16 being substantially oval in shape, as is best seen in Fig. 3.

The end plate 31, Fig.4, is substantially of the same construction as the lower end portion, or body member 43 of the end plate 36, and the parts thereof which are similar to correspondin parts of the end plate 36 are indicated in the drawings by the same reference numerals with the suffix a added thereto. It-will beseen that the end plate 3? difiers from the end plate 36 in not having an upper arm or projection thereon such as the arm 59, the end plate 3.! terminating at its top at the outer face of the flan e Two threaded end portions or studs 69a and him, corresponding to the studs 59 and I0, project from the ends of the side bars .40 and 4|, respectively, opposite the ends from which the studs 69 and I'Uextend, and proiectthrough suitable openings formed in the bosses 56a and 67a, respectively, of the end plate 31, Figs. 2 and 4. Two nuts 12a and 13a are mounted on the studs Sta and ma and releasably hold the latter in their aforementioned position in the end plate 31.

The main body portions of the two side bars 40 and 4| are circular in cross-section, Fig. 3, and, as is best seen in Figs. 1 and ,2, are-substantially the same diameter asthe looses 55, ISL-65a and cm on the end plates, being held in abutting relation therewith by'the nuts 12, 73,1241 and'l3a. Thus it will be seen that the two end plates 3B and .31 and the two side bars Mi and 4|, when disposed in the assembled relation shown in the drawings, form a rigid frame member. Two bolts ll and M are mounted .in suitable tapped openings, formed in the web 4501? theend plate 36 and afiord adjustable abutment members engageable with the headstock .24 for spacing theirame .20 therefrom. Means such as lock-nuts 18 may be used to secure the bolts 1-4 and .15 .in adjusted position in the Web .45.

The tool holding device .34 includes :a housing 8|, comprising a casing 11 and a substantially U-shaped supportingmember .19 mountedin inverted position on the upper end portionof the casing 17, the supporting member 19 be n cured to the casing Tl by any suitable means such as Welding 80.

Two wings or hanger members 82 and 83, Figs. 2 and 6, project outwardly from opposite sides of the casing H. The hangers 82 and 83 have cylindrical shaped openings 85 and 853, respectively, formed therein through which the side bars 40 and 4| extend to thereby support the housing 3|, the openings 85 and 86 being of such size that the sidewalls thereof snugly engage the exterior surface of side bars 40 and ll, without binding thereon, to thereby prevent movement of the housing 8| transversely to the bars 40 and 4| A .rod 81 and tour set-screws 89 are eiiective to hold the tool-holding device 34 against longitudinal :movementcn the rods 40 and 4|, the rod 8'! having one end connected to the U-shaped member '1'9 and the other end thereof connected to the end plate '36, and the set-screws 89 being mounted in the lower portion of the hanger members 82 and 83 and releasably engaged with the rods 40 and El. It will be understood that different length rods 8'! may be used to hold the tool-holding device 34 in different desired positions relative to the end plate 35.

The casing "I7 has a cylindrical-shaped bore. extending vertically therethrough, and a cylinder 99, Fig. 5, is mounted in the bore 88 for reciprocation therein.

The cylinder 9D has a cylindrical-shaped opening 92 extending axially therethrough. The outer end portions 9:: and of the opening 82 are enlarged to afford shoulders-91 and 98 therein. Two ball bearings I00 and NH are mounted in the enlarged portions .94 and 95, respectively, of the opening 92, for a purpose which will be discussed in greater detail presently, and are held in engagement with the respective shoulders 91 and 98 by suitable means such as discs I92 and I93 screwed into the outer end portions of the passageway 92.

An opening I95 extends-through the center of the closed end portionof the U-shaped supporting member 19 in axial alignment with the opening 92 in the cylinder 90, and an elongated shaft I07 extendsthrough the openings 92 and I05 and is rotatably mounted therein, being journaled in the bearings IOU-and IOI.

As is best seen inFig. 5, the shaft It! comprises three separate parts, namely, a spindle I09, a sleeve III and a rod or bolt II3, all secured together to form a unitary member as will be discussed in greater detail hereinafter.

The spindle N39 is journaled in the bearin MI and has one end positioned in abutting relation to the bearing I09, and the other end projecting downwardly from the housing 81. The latter end of the spindle has a tapered bore I I5 formed therein which is adapted to receive the tapered shank of a cutter holder or a tool having a conventional Morse taper. In the drawings, a cutter holder II'I, having a bore H8 formed therein, in which the shank of a cutter or tool may be mounted. in a manner well known to those skilled in the art, is shown. However, in some instances it is desirable to insert the shank of a tool directly into the spindle I09, and it will be understood that my invention is not limited to the use of the cutter holder II! but that other types of cutter holders, tools, and the like, may be used as desired by those skilled in the art without departing from the purview of my invention.

The sleeve HI has one end portion journaled in the bearing I00 and in abutment with the adjacent end of the spindle I09. The other end.

of the sleeve III projects upwardly from the housing through the opening I05, the mid-' portion of the sleeve II I being journaled in this latter opening.

The bolt or rod II3 has a head I formed on one end thereof and is mounted in the housing 8| with the head I20 positioned in the inner end portion of the tapered bore I I5'in the spindle I09 and the shank thereof projecting upwardly through the sleeve I I I. A nut I22 is mounted on the free upper end portion of the bolt H3 and is engaged with the upper edge of the sleeve III, this nut being effective during normal operation of my attachment to hold the sleeve I I I and the spindle I09 in tight frictional engagement with each other so that the shaft I01 is rotatable as a unit in the bearing I00 and NH, to thereby rotate a tool supported by the spindle I09, as will be described presently. Suitable means such as a pin I23 may be used to'hold the nut I22 in adjusted position on the bolt II3. A threaded extension or stud I25 preferably projects from the head I29 of the bolt II3 intothe tapered opening H5 and is engageable in a tapped opening I26 provided in the cutter holders or tools used in my attachment, to firmly hold the cutter holders or tools in operative position in the spindle I09. The direction of the threads on the extension I25 is such that the tool or cutter holder with which they are engaged is prevented from unscrewing therefrom during normal operative rotation of the spindle I09 and thereby insures that the cutter holder or tool will remain in proper position in the spindle I09 during a machine operation.

A pulley wheel I28, of the type adapted to be driven by a V-belt, and having a ball bearing I30, is mounted on a cylindrical-shaped projection I32 formed on the closed end portion of the U-shaped member 19, the projection I32 extending around, and affording a portion of the side walls for the opening I05 through which the sleeve III projects.

The wheel I28 has a hub I34 projecting from one side thereof, and a spline I36 formed in the hub I34, Fig. 2, is engaged in an elongated slot 138, Figs. 2 and 5, formed in the outer surface of the sleeve I I I, to afford a driving connection between the pulley I28 and the shaft I01. I38 is of considerably greater length than the spline I and, therefore, it will be seen that the shaft I01 may be moved longitudinally with relation to the pulley wheel I28 without interrupting, the driving connection between the wheel I28 and the slot I91, as will be discussed in greater detail presently.

The power for driving the shaft I01 of my invention, to thereby rotate the spindle I09 and, therefore, the tool carried thereby in an operation of the attachment 20, is provided by the lathe 22. For this purpose a coupling member I80 is mounted in the headstock 24 of the lathe 22, in operative engagement with the drive spin dle thereof, and projects from the headstock 24 outwardly through the opening 15 in the end plate 30. A V-pulley I42 is mounted on the free end portion of the coupling member I for rotation therewith and is connected to the pulley wheel I28 by a V-belt I44.

Two idler pulleys I46 and I41, for guiding the V-belt IM between the drive pulley I42 and the pulley wheel I28, are rotatably mounted on a shaft I48 mounted in one end portion of an arm- I50, l and 2. The other end of the arm I50 is pivotally mounted on a shaft I52 extending through two ears I54 and I55, Fig. 2, projecting The slot l position of the arm I50 on the shaft I52.

from the end plate 38, the arm I50 projecting forwardly from the ears I54 and I55 through a slot I51, formed in the web 6| of the arm 59, Fig. 3. The slot I51 is large enough to permit relatively free pivotal movement of the arm I50 on the shaft I52. A threaded rod I59, having one end pivotally connected to the arm I50 by a pin I8 I, extends through the upper end portion of the end plate 36 and affords means for adjusting the Suitable means such as .a nut I63, mounted on the end of the rod I59, adjusts the effective length of the-rod I59 to thereby support the arm I50 in proper position. Thus it will be seen that by manipulating the nut I63 the position of the arm B50 and, therefore, of the idler pulleys I46 and I41 may be readil adjusted to thereby adjust the tension of the V-belt I44.

Vertical adjustment of the shaft therefore, of the spindle I09 and a tool carried thereby, is afforded in my novel attachment by readily manipulated manually operable means. For this purpose a rack I65, Figs. 5 and 6 is mounted in a slot I68 formed in the side wall of the cylinder and extends longitudinally thereof, suitable means such as screw I58 and I69 securing the rack I65 in position in the slot I65. A shaft I1I is journaled in suitable bearings !'53 and I14 formed in the casing 11, and a gear I16, engaged with the rack I65, is secured to the shaft IN by suitable means such as a screw I18, for rotation therewith. A worm gear I80, operatively engaged with a worm I82 is also mounted on the shaft HI and secured thereto by a screw I 84. The worm I02 is secured to a shaft I88 which is journaled in the casing 11 and extends outwardly therefrom. A handle I88 is mounted on the outwardly extending portion of the shaft 86 and is operable to be manually rotated to thereby rotate the worm I82, the gear I80, the

shaft HI, and the gear I15, and thereby move the rack I65 upwardly or downwardly, as viewed in Fig. 5, to adjust the vertical position of the cylinder 90 within the housing 8L Suitable indicia such as, for example, the Vernier I90, shown in Fig. 1, may be used, if desired, to accurately indicate the vertical adjustment of the cylinder 90 within the housing 8!, as indicated by the position of the handle I88.

It will be remembered that the shaft I01, al-

though rotatably mounted in the cylinder 90, is

secured therein against longitudinal movement relative thereto by the engagement of bearings I00 and IOI and the disc I02 and I93. Thus it will be seen that movement of the cylinder 90 in a longitudinal direction is effective to impart like movement to the shaft I01, and, therefore, when the position of cylinder 90 is adjusted by manipulation of the handle I88, as previously discussed, a like adjustment of the shaft I01 is efiected.

A common type of locking device I92, Figs. 1 and 5, comprising a handle I93 which is effective to rotate a cam or off-set portion I95 mounted on a shaft I96, is operable to releasably secure the ,hold the cylinder 90 in adjusted position. When m1 and, I

it is desired to free the cylinder 90 from such locking engagement with the locking device I92 the handle I93 ma be manually moved to the position shown in dotted lines in Fig. which is effective to rotate the cam 195 on the shaft I96 in a clockwise direction, as viewed in 5, out of engagement with the cylinder 80.

Operation In a typical operation of my novel attachment, the usual live-center would normally be removed from the headstock '2 and the couplin member I40, having th'e'drive pulley I I'Z mounted thereon, would be substituted therefor. The attachment '20, comprising the frame member 32 and the tQoLholding device 34 may then be mounted on the ways '26 and 27 of the lathe 22, with the spacing bolts T4 and "H3 in firm ehgag'eme'nt with the headstock 2 S and the clamping plates 53 and 53a may be moved into clampin'g engagement with the ways by tightening the nuts 57 and 51a. The engagement of the spacing bolts II and T4 with the headstock 24 insures the proper spacing of the frame member 32 from the headstock, and also affords added sup ort and rigidity to the end plate 36.

The frame member 32 having been placed n proper position on the ways 26 and '21, the V- belt I4 may then be positioned over the drive pulley I42, the pulley wheel I28, and the idler pulleys I46 and Ii-1 and the tension on the V- bel't H maybe adjusted by turning the nut I63 in the'proper direction to chest adjustment of the hanger arm 'I 50.

The work upon which the machine operation is *to be performed may then be mounted in the vise "3'I on the carriage 23 and a milling cutter, boring tool, or other tool which it is desired to use in this operation may be mounted in the spindle I09 of the shaft IE1. Vertical adjustment of the tool, relative to the work positioned in the vise '3I' may be effected by 'rot'ating the handle I88 to thereby raise and lower the cylinder 9b and the shaft T01 so that the tool is disposed in proper operative position relative to the Work.

When using my novel attachment in o erations requiring lateral movement of the work and tool relative to each-other, the usual longitudinal feed and cross feed or the lathe -22 ma be utilized to eliect lateral movement or the work relative to the tool,"the'too1, in this instance, being held in stationary vertical position in the holdmg device at and being rotated by the driving connection between the pulley "I42 and the pulley wheel I28.

In those operations wherein it is necessary to move the tool vertically relative to the work being held in the vise 3|, such as, for example, in boring operations, the work may be disposed in the desired position relative to the tool by manipulating the longitudinal "feed and cross feed of the lathe 22 and may then be locked in this position *by disconnecting the automatic longitudinal and cross feed of the lathe. Vertical movement of the tool, during such an operation, may be effected by turning the handle I88 to thereby cause the cylinder 99 and the shaft I07 and, therefore, the spindle I09 and the tool held thereby, to be moved in a vertical direction. During such vertical movement of the shaft I01, the sleeve HI, through its 's'plined connection with the pulley wheel I28 is freely slidable through the pulley wheel 128 While mam'taining its driving connection therewith.

In some instances it may be found that certain work pieces such as elongated rods, pipes and the like do not fit conveniently between the end plates 36 and 31, and in such instances the work pieces may often be extended through the openings 15a or 16a in the end plate 37, with that portion of the work piece upon which the machine operation is to be performed disposed in cp'eri'ttive position between the end plates 36 and '31 "and with the vise 3I' and the tool-holding device 3! properly adjusted for the particular operation.

From the foregoing it will be seen that I have provided a novel milling and boring attachment for lathes which may be readily positioned on the ways ofth'e usual lathe and which, when so positioned, is readily operable, in a novel and expeditious manner, to perform milling, boring, and like operations.

Also it Will be 'seen that through the hovel construction of my attachment vertical adjustment of the tools held thereby may be quickly and easily accomplished in a novel and expeditiou's manner.

In addition it will be seen that the novel construction of my attachment insures that the tool supported thereby will be firmly supported during an operation of the attachment and will be accurately positioned relative to the work upon which the'operation is being performed.

Thus, while I have illustrated and described the preferred embodiment of my invention, it is tobc'understood that this is capable of variation and modification and I therefore do not wish to be lin'ii'ted to the precise details Set forth, ut desire to avail myself of such'chahges and alteration's as fall within the purview of the following claims.

Iclaim:

1. In a lathe having a headstock, a rotatable drive member projecting from said headstock,

a drive pulley operatively connected to said drive member and rotatable thereby, and ways extending from said headstock, two parallel end plates releasably secured to said Ways and extending transversely thereto, one of said end plates having an opening therein and being so disposed relative to said headstock that said drive member extends through said opening and said drive pulley is disposed on the opposite side of said one end plate from said headstock, two parallel side bars interconnecting said end plates, a housing mounted on said side bars, means for holding said housing in fixed position relative to said end plates, a spindle for holding tools rotatably mounted in vertically extending position in said housing and vertically slidable therein, means for vertically adjusting said spindle in said housing, a pulley wheel mounted on said spindle and operable upon rotation to rotate the latter, said spindle being longitudinally slidable through said pulley wheel, and a belt operatively connecting said pulley Wheel to said drive pulley and operable to rotate said pulley wheel upon rotation of said-drive pulley.

.2. A milling and boring attachment for lath'es of the type having a headstock, a rotatable drive member projecting from said headstock, a drive pulley mounted on said drive member and rotatable therewith, and ways projecting from said headstock in the same direction as said drive member, said attachment comprising a frame member having two parallel and plates and two parallel-sidebars interconnecting said end plates,

rope oisaid end plates having an opening therein for receiving said drive member therethrough with said drive pulley positioned within the area defined by said frame member when said frame member is disposed in operative position on said ways, means for securing said frame member in such position on said ways, a housing mounted on said side bars, a spindle mounted in said housing in vertically extending position, said spindle being movable in a longitudinal direction within said housing and being adapted to operatively hold a tool, means for vertically adjusting the position of said spindle within said housing, a pulley Wheel connected to said spindle for driving the latter, and means engaged with said pulley wheel for drivingly connecting said drive pulley to said pulley wheel of such a lathe when said frame member is disposed in said operative position.

3. A milling and boring attachment for lathes of the type having a headstock, a rotatable drive member projecting from said headstock, a drive pulley mounted on said drive member and rotatable therewith, and ways projecting from said headstock in the same direction as said drive member, said attachment comprising a frame member having two parallel end plates and two parallel side bars interconnecting said end plates, one of said end plates having an opening therein, means on said frame member for securing said frame member in operative position on said ways wherein said drive member extends through said opening with said drive pulley positioned within the area defined by said frame member, a housing mounted on said side bars, a bearing member movably mounted in said housing, a shaft extending through said bearing member and said housing and including a spindle adapted to hold a tool in operative position, said shaft being connected to said bearing member for longitudinal movement therewith, means for adjusting the position of said bearing member in said housing to thereby adjust the position of said shaft relative to such a lathe, a pulley wheel mounted on said shaft and having a driving connection therewith, said shaft being movable in a longitudinal direction relative to said pulley wheel, and means including a belt adapted to operatively connect said drive pulley to said pulley wheel for rotating said pulley wheel and said shaft upon rotation of said drive pulley when said frame member is in said operative position.

4. In an attachment for lathes having a headstock, ways projecting from said headstock, a drive spindle projecting from said headstock, and a drive pulley mounted on said spindle for rotation therewith, two parallel end plates transversely mounted on the ways of the lathe, means for releasably securing said end plates to said ways, one of said end plates having an opening formed therein and being so positioned relative to said headstock that said drive spindle projects through said opening and said pulley is positioned on the opposite side of said one end plate from said head stock, two parallel bars spaced above said ways and connecting said end plates together, a housing mounted on said two bars, a shaft rotatably mounted in said housing, said shaft projecting between said two bars and having a portion adapted to hold a tool, a pulley wheel mounted on said shaft for rotating the latter, a plurality of idler pulleys mounted on said one end plate, and a drive belt operatively trained over said drive pulley, said idler pulleys, and

10 said pulley wheel for driving said pulley wheel and said shaft upon rotation of said drive pulley.

5. In a lathe having a headstock, a rotatable drive member projecting from said headstock, driving means operatively connected to said drive member and rotatable thereby, and ways extending from said headstock, two parallel end plates releasably secured to said ways and extending transversely thereto, one of said end plates having an opening therein and being so disposed relative to said headstock that said drive member extends through said opening and said driving means is disposed on the opposite side of said one end plate from said headstock, elongated supporting means interconnecting said end plates, a housing mounted on said supporting means, means for holding said housing in fixed position relative to said end plates, a spindle for holding tools rotatably mounted in vertically extending position in said housing and vertically movable therein, means for vertically adjusting said spindle in said housing, a driving member mounted on said spindle and operable upon rotation to rotate the latter, said spindle being longitudinally slidable through said driving member, and other driving means operatively connecting said driving member to said first mentioned driving means and operable to rotate said driving member upon rotation of said first mentioned driving means.

6. In an attachment for lathes having a headstock, ways projecting from said headstock, a drive spindle projecting from said headstock, and driving means mounted on said spindle for rotation therewith, two parallel end plates transversely mounted on the ways of the lathe, means for releasably securing said end plates to said ways, one of said end plates having an opening formed therein and being so positioned relative to said headstock that said drive spindle projects through said opening and said driving means is positioned on the opposite side of said one end plate from said headstock, supporting means spaced above said ways and connecting said end plates together, a housing mounted on said supporting means, a shaft rotatably mounted in said housing, said shaft projecting toward said ways and having a portion adapted to hold a tool, a driving member mounted on said shaft for rotating the latter, and other driving means operatively connected to said driving member and said first mentioned driving means for rotating said driving member upon rotation of said first mentioned driving means.

RAYMOND C. PALMER.

References Gited in the file of this patent UNITED STATES PATENTS Number Name Date 1,614,432 Meyer Jan. 11, 1927 2,011,835 Stull Aug. 20, 1935 2,106,835 Forward Feb. 1, 1938 2,116,248 Moser May 3, 1938 2,178,130 Zwick Oct. 31, 1939 2,203,943 Davis June 11, 1940 2,375,789 I-Iungerford May 15, 1945 2,386,461 Hellman Oct. 9, 1945 2,455,662 Dyer Dec. 7, 1948 FOREIGN PATENTS Number Country Date 291,202 Germany May 26, 1917 

